In modern shinobi schools, girls devote their youth to mastering the ways of the true shinobi. They undergo rigorous training, sparring with one another to refine their skills. One fateful Christmas day, Asuka, whose grandfather was a renowned shinobi, crosses paths with a malevolent entity known as a "Youma" lurking in Tokyo's shadowy alleyways. From light comes shadow, and now, 28 of the most accomplished and formidable ninjas, both virtuous and wicked, will engage in a life-threatening brawl to define what is just. The fierce confrontation is underway, and the outcome hangs in the balance.